When was the Gospel of Thomas written?
This is a question hotly debated by scholars. Many scholars say that it was written at about the same time, even perhaps somewhat before, the gospels in the bible. Their argument is that most of the sayings in Thomas show no signs of having any dependence on, or knowledge of, the Biblical gospels and so Thomas’ sayings derive from oral tradition and not from written Biblical texts. This doesn’t seem to have been possible after the end of the first century when the Biblical texts began to be authoritative in Christianity. Other scholars find bits of evidence that indicate that Thomas was indeed dependent, in part, on Biblical texts, and surmise that the author of Thomas must have edited out almost all indications of the particular styles and ideas of the Biblical authors. Those scholars date Thomas in the mid second century A.D.